Maintenance; Modifications And Spare Parts; Troubleshooting - DAB NKV Série Instructions Pour L'installation Et La Maintenance


When the pump remains inactive for a long time at temperatures of less than 0°C, the pump body must be
completely emptied through the drain cap.
Check that the leakage of liquid does not damage persons or things, especially in plants that
use hot water.

It is recommended to empty the pump when it is
not running for a long time at normal temperature.

The drain plug shall be opened until the pump will
be utilized again.

When restarting after long periods of inactivity it is
necessary to repeat the operations described
above in the paragraphs WARNINGS and
STARTING UP.

9. MAINTENANCE


In normal operating conditions the electropump
does not require any kind of maintenance.

It is recommended to check time by time current
absorption, pressure head at closed valve and
maximum flow.

The electropump can only be dismantled by
specialised, skilled personnel in possession of
the qualifications required by the specific
regulations.

10. TROUBLESHOOTING

Fault
The motor does not start and makes
no noise.
The motor does not start but makes
noise.
The motor turns with difficulty.
The (external) motor protection trips
immediately after starting.
ENGLISH


9.1 Modifications and spare parts

Any modification not authorised beforehand relieves the
manufacturer of all responsibility. All the spare parts
must be authentic and all the accessories must be
authorised by the manufacturer.
Check (possible cause)
 Check the protection fuses.
 Check the electric connections.
 Check that the motor is live.
 Motor protector cut-off the motor,
for the single-phased motors, due
to over heating of tag windings.
 Check
that supply
correspond with voltage on the
pump label.
 Check the electrical connections.
 Check that all the phases are
present.
 Check for obstructions in the
pump or motor.
 Verify that supply voltage is at an
acceptable valve.
 Check whether any moving parts
are scraping against fixed parts.
 Check the state of the bearings.
 Check that all the phases are
present.
 Look for possible open or dirty
contacts in the protection.
 Look for possible faulty insulation
of the motor, checking the phase
resistance and insulation to earth.
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In any case all repair and maintenance jobs must be
carried out only after having disconnected the
pump from the power mains.
If the liquid has to be drained out
maintenance, ensure that the liquid
coming out cannot harm persons or
things, especially in using hot water.
The legal requirements on the disposal
of any harmful fluids must also be
complied with.
Carry out maintenance based on the
type of bearing indicated on the
technical data plate.
If they are burnt-out, change them.
Correct any errors.
Wait for automatic reset of the motor
protector once the temperature has
fallen below the maximum limit.
voltage
Correct any errors.
Restore the missing phase.
Remove any obstructions.
Eliminate the cause of the scraping.
Change any worn bearings.
Restore the missing phase.
Change or clean the component
concerned.
Change the motor casing with the
stator
discharging to earth.
Remedy
or reset any cables